Logged in as
Pinch to Zoom Electrocardiograms
Identify the blue label
| Last 24 Days | |||
| 1 | 2 | 3 | 4 |
| 5 | 6 | 7 | 8 |
| 9 | 10 | 11 | 12 |
| 13 | 14 | 15 | 16 |
| 17 | 18 | 19 | 20 |
| 21 | 22 | 23 | 24 |
| April 30 | |||
| 0 | 6 | 12 | 18 |
| 1 | 7 | 13 | 19 |
| 2 | 8 | 14 | 20 |
| 3 | 9 | 15 | 21 |
| 4 | 10 | 16 | 22 |
| 5 | 11 | 17 | 23 |
| Yesterday | |||
| 0 | 6 | 12 | 18 |
| 1 | 7 | 13 | 19 |
| 2 | 8 | 14 | 20 |
| 3 | 9 | 15 | 21 |
| 4 | 10 | 16 | 22 |
| 5 | 11 | 17 | 23 |
| Today | |||
| 0 | 6 | 12 | 18 |
| 1 | 7 | 13 | 19 |
| 2 | 8 | 14 | 20 |
| 3 | 9 | 15 | 21 |
| 4 | 10 | 16 | 22 |
| 5 | 11 | 17 | 23 |
×
Depolarization goes from negative to positive. Repolarization goes from positive to negative.
Electrical signal starts at Sinoatrial node (SA node)
Atrioventricular node (AV node)
Bundle of His
Purkinje fibers of ventricles
Automaticity spontaneously depolarize and fire action potentials
The Waves P Q R S T
Action Potential phases
Phase 0 Depolarized Upstroke: Cell is depolarized to threshold by AP
Phase 1 Initial Repolarization: K current transiently repolarizes due to inactivation of Na channels
Phase 2 Plateau Phase: generated by long-acting inward Ca current (slow inactivation)
There is a stable depolarizing effect because K is still leaving
Phase 3 Repolarization: Delayed rectifier K channels activate and inward rectifier K channels activate, leading to repolarization
Phase 4 Resting membrane is fully depolarized (-85mV)
outward K current = inward Ca + Na current
More permeable to K; closed Na channel (excitable)
Na/K pump, Na/Ca exchanger help regenerate resting potential
Atrial fibrillation
Atrial flutter
P waves represent atrial depolarisation
The QRS complex represents depolarisation of the ventricles
The T wave represents ventricular repolarisation
*SA node, AV node, atrial fibrillation, depolarize, arrhythmia, P, QRS, T
Atria
Ventricles
Ventricles
Depolarization
P Wave, QRS Wave
P Wave, QRS Wave
P Wave
Atria
Atria
QRS Wave
Ventricles
Ventricles
What does the P wave represent? Atrial Depolarization
| 1 | 2 | 3 | 4 | 5 |
| 1 | 2 | 3 | 4 | 5 |
What does the QRS wave represent? Ventricular Depolarization
| 1 | 2 | 3 | 4 | 5 |
| 1 | 2 | 3 | 4 | 5 |
| 1 | 2 | 3 | 4 | 5 |
| 1 | 2 | 3 | 4 | 5 |
Where does an electrical signal start? Right atrium
| 1 | 2 | 3 | 4 | 5 |
| 1 | 2 | 3 | 4 | 5 |
What is the first phase of cardiac action potential? Depolarization
| 1 | 2 | 3 | 4 | 5 |
| 1 | 2 | 3 | 4 | 5 |
| 1 | 2 | 3 | 4 | 5 |
| 1 | 2 | 3 | 4 | 5 |
Which charge does sodium carry? Positive
| 1 | 2 | 3 | 4 | 5 |
| 1 | 2 | 3 | 4 | 5 |
| 1 | 2 | 3 | 4 | 5 |
| 1 | 2 | 3 | 4 | 5 |
What occurs in Phase 3? Repolarization
| 1 | 2 | 3 | 4 | 5 |
| 1 | 2 | 3 | 4 | 5 |
79k 55 12m
Introduction to Electrocardiogram
Nov 05, 2014 1m ago
168k 31 11m
Depolarization waves flowing through the heart - NCLEX-RN - Khan Academy
Oct 07, 2012 8y ago
52k 83 21m
Rate and Rhythm - Normal Sinus Rhythm
Dec 11, 2019 1y ago
306k 996 53m
Cardiovascular - ECG Basics
Nov 30, 2019 1y ago
448k 274 20m
Cardiovascular - EKG's
Mar 08, 2017 3y ago
238k 38 5m
Dirty Dancing - Patrick Swayze and Jennifer Grey - Hungry Eyes
Mar 01, 2011 9y ago
1.5M 126 1m
How a Normal Heart Pumps Blood -- The Children's Hospital of Philadelphia
Mar 02, 2011 9y ago
1.4M 254 2m
The Pathway of Blood Flow Through the Heart Animated Tutorial.
Jan 02, 2014 6y ago
72k 0 2m
What is Atrial Fibrillation?
May 13, 2019 1y ago
246k 33 2m
What is atrial fibrillation?
Oct 31, 2012 1m ago
32k 4 4m
Atrial Fibrillation
Jan 28, 2015 5y ago
51k 12 9m
What is Atrial Fibrillation (AFib)? This Video Explains It
Jan 15, 2015 5y ago
5k 5 4m
EKG like a BOSS Part 2 - The 5 Step Method
Oct 30, 2019 1y ago
7k 8 11m
EKG like a BOSS Part 3 - Abnormal Heart Rhythms
Oct 31, 2019 1y ago
731k 142 1m
The cardiac cycle
Sep 10, 2012 8y ago
1.3M 130 3m
Anatomy & Physiology Online - Cardiac conduction system and its relationship with ECG
Nov 12, 2010 1m ago
121k 16 1m
Cardiac Conduction System
Nov 18, 2011 9y ago
1.1M 241 9m
Electrical system of the heart - Circulatory system physiology - NCLEX-RN - Khan Academy
Oct 07, 2012 8y ago
544k 87 8m
Normal sinus rhythm on an EKG - Circulatory System and Disease - NCLEX-RN - Khan Academy
Jul 08, 2014 6y ago
632k 193 7m
How to Memorize the PQRST EKG Rhythm Strip Wave for Anatomy & Pathophysiology
May 21, 2015 5y ago
632k 400 27m
EKG or ECG- Simple Simple!
Jan 13, 2014 6y ago
610k 127 6m
Cardiac Arrhythmias
Dec 10, 2015 5y ago
3M 2k 12m
EKG/ECG Interpretation (Basic) : Easy and Simple!
Feb 13, 2017 3y ago
704k 268 12m
P,Q,R,S,T waves in the EKG
Jan 23, 2016 4y ago
3.5M 541 3m
Cardiac Conduction System and Understanding ECG, Animation.
Apr 29, 2014 6y ago
2.1M 376 9m
Lub Dub - Circulatory system physiology - NCLEX-RN - Khan Academy
Oct 11, 2012 8y ago
9k 5 7m
EKG Interpretation - Placement of EKG leads, Heart Conduction System and EKG Basics
Jan 17, 2020 10m ago
9k 7 10m
EKG Interpretation - Analysis of Heart Rhythm, Heart Rate, P wave, PR interval and QRS complex
Jan 17, 2020 10m ago
7k 11 6m
EKG Interpretation - Sinus Rhythms
Jan 24, 2020 10m ago
8k 7 7m
EKG Interpretation - Atrial Rhythms
Jan 27, 2020 10m ago
5k 3 6m
EKG Interpretation - Junctional Rhythms
Jan 29, 2020 10m ago
5k 15 9m
EKG Interpretation - Atrioventricular Blocks (AV Blocks)
Feb 03, 2020 10m ago
4k 13 7m
EKG Interpretation - Artificial Pacemakers, Tachycardia and Bradycardia
Feb 07, 2020 10m ago
2 1 1:9
11/16 office hours/ EKG rhythms
Nov 18, 2020 27d ago
15
1
26
2
20
21
16
13
26
6
16
14
5
4
7
5
3
16
9
17
9
5
12
14
8
25
10
1
4
9
20
13
17
14
4
4
22
9
7
5
5
20
8
10
9
4
1
14
3
12
23
14
23
8
6
3
8
15
2
The Waves P Q R S T
Action Potential phases
P waves represent atrial depolarisation
The QRS complex represents depolarisation of the ventricles
The T wave represents ventricular repolarisation
The Waves P Q R S T
Action Potential phases
P waves represent atrial depolarisation
The QRS complex represents depolarisation of the ventricles
The T wave represents ventricular repolarisation